here lately...something's been messing up in my shifter. I'll be in 2nd gear, at a low speed (roughly 20 mph or so) just driving along, let's say through a parking lot or pulling in my driveway. My shifter will rattle and try to pop out of gear. And when I push in the clutch and pull it down to 2nd again, it grinds a little. Is it my syncromesh? Or something way worse? Any help is greatly appreciated.

Thanks in advance